80778025 has 24 divisors (see below), whose sum is σ = 106153920. Its totient is φ = 60805440.

The previous prime is 80778023. The next prime is 80778029. The reversal of 80778025 is 52087708.

It is not a de Polignac number, because 80778025 - 2¹ = 80778023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80778023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81684 + ... + 82666.

It is an arithmetic number, because the mean of its divisors is an integer number (4423080).

Almost surely, 2^80778025 is an apocalyptic number.

It is an amenable number.

80778025 is a deficient number, since it is larger than the sum of its proper divisors (25375895).

80778025 is a wasteful number, since it uses less digits than its factorization.

80778025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 80778025 is about 8987.6595952450. The cubic root of 80778025 is about 432.2792707982.

The spelling of 80778025 in words is "eighty million, seven hundred seventy-eight thousand, twenty-five".